monkeyking/packages/tree-extension/style/base.css

.jp-FileBrowser {
  height: 100%;
}

.lm-TabPanel {
  height: 100%;
}

.jp-TreePanel .lm-TabPanel-tabBar {
  border: none;
  overflow: visible;
  min-height: 28px;
}

.jp-TreePanel .lm-TabBar-tab {
  color: var(--jp-ui-font-color0);
  font-size: var(--jp-ui-font-size1);
  padding: 5px;
}

.jp-TreePanel .lm-TabBar-tabLabel {
  padding-left: 5px;
  padding-right: 5px;
}